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FlexVols migrated from Data ONTAP 7-Mode show higher-than-expected space usage

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Category:
ontap-9
Specialty:
7dot
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Applies to

  • ONTAP 9
  • FlexVol migrated from Data ONTAP 7-Mode using 7-Mode Transition Tool (7MTT)

Issue

  • The volume show-space command shows a higher-than-expected amount of metadata usage, specifically Inodes and Deduplication:
Vserver : svm1
Volume  : vol1
 
Feature                                    Used      Used%
--------------------------------     ----------     ------
User Data                               303.3GB        61%
Filesystem Metadata                     11.59GB         2%
Inodes                                  71.99GB        14%
Deduplication                           52.29GB        10%
Quota Metadata                             20KB         0%
Performance Metadata                    298.6MB         0%
 
Total Used                              439.5GB        88%
 
Total Physical Used                     439.5GB        88%
  • Deduplication is not enabled on the volume
  • Inode usage on volume is low (from df -i):
/vol/svol1/      3210937  246789057      1%

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